Hi @Jubin.Patel ,
Thank you for posting to the community.
The default email subject cannot be changed, but if you wish to use a custom subject line, then you may create your own Email Template, which allows you to define your own subject line as well as body contents.
Please see the document below for details of Email Template.
https://docs.appdynamics.com/21.6/en/appdynamics-essentials/alert-and-respond/actions/notification-actions/email-templates
Default email template is included in the following document for reference.
https://docs.appdynamics.com/21.6/en/appdynamics-essentials/alert-and-respond/actions/predefined-templating-variables
If you are already using Email Template and there is an extra keyword in the subject, could you give us more information related to the template and an extra keyword? (Please eliminate any personally-identifying information or content)
Best Regards,
Hiroki
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